ddj-1000 & ddj-flx6

is there any way to make both controllers function within rekordbox at the same time, as i wish to use the flx-6 to control decks 3 & 4, tried switching it to midi mode and rekordbox don't see it, yet i can program a novation device while i have a ddj-1000, xp1 connected.

I just installed rekordbox 5 and it works with all 3 devices with the exception of the flx6 jogs.